166856430272 has 56 divisors (see below), whose sum is σ = 380912705280. Its totient is φ = 71036294400.

The previous prime is 166856430229. The next prime is 166856430383. The reversal of 166856430272 is 272034658661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×166856430272² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166856430272.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165622 + ... + 1300917.

Almost surely, 2^166856430272 is an apocalyptic number.

It is an amenable number.

166856430272 is an abundant number, since it is smaller than the sum of its proper divisors (214056275008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166856430272 is a wasteful number, since it uses less digits than its factorization.

166856430272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466709 (or 2466699 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 166856430272 in words is "one hundred sixty-six billion, eight hundred fifty-six million, four hundred thirty thousand, two hundred seventy-two".